feat: initial owlry application launcher

Owl-themed Wayland application launcher with GTK4 and layer-shell.

Features:
- Provider-based architecture (apps, commands, systemd user services)
- Filter tabs and prefix shortcuts (:app, :cmd, :uuctl)
- Submenu actions for systemd services (start/stop/restart/status/journal)
- Smart terminal detection with fallback chain
- CLI options for mode selection (--mode, --providers)
- Fuzzy search with configurable max results
- Custom owl-inspired dark theme

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/ui/mod.rs

@@ -0,0 +1,5 @@
+mod main_window;
+mod result_row;
+
+pub use main_window::MainWindow;
+pub use result_row::ResultRow;